The Drive Medical Square Pre Gelled TENS Unit Electrodes provide the optimum in performance when it is needed the most. Shaped like squares, and soft since they are made from fabric, they are easy to place onto the area and send impulses through. The TENS electrodes are to be used with the TENS devices that they match. The multitask gel type and lightweight design reduces the chances of negative reactions. The reliable impulse delivery is effective and efficient with use of the correct TENS system.